Breyer invested personally in Marvel, while he represented Accel investment in BBN. He sat on both boards (and also is a board member of Facebook, Dell, Walmart, Etsy, Brightcove, Prosper, and Real Networks). At BBN, Accel co-led a management buyout five years ago with General Catalyst Partners.

BBN is a storied technology R&D powerhouse. Started in 1948 by a group of MIT professors, it invented many of the technologies of the early Internet, including packet switching (1969), the first network email (1971), the first router (1976). It also came up with the @ sign, but much of its work is for the military, which is why Raytheon snapped it up.